68 lines
2.7 KiB
Java
68 lines
2.7 KiB
Java
/*
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.Instrumentation;
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import java.lang.instrument.IllegalClassFormatException;
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import java.security.ProtectionDomain;
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public class AnonVmClassesDuringDumpTransformer implements ClassFileTransformer {
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public byte[] transform(ClassLoader loader, String name, Class<?> classBeingRedefined,
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ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException {
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return null;
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}
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private static Instrumentation savedInstrumentation;
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public static void premain(String agentArguments, Instrumentation instrumentation) {
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System.out.println("ClassFileTransformer.premain() is called");
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instrumentation.addTransformer(new AnonVmClassesDuringDumpTransformer(), /*canRetransform=*/true);
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savedInstrumentation = instrumentation;
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// This will create a Lambda, which will result in some Anonymous VM Classes
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// being generated.
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//
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// Look for something like these in the STDOUT:
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// ----------------
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// ClassFileTransformer.premain() is called
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// Dumping class files to DUMP_CLASS_FILES/...
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// dump: DUMP_CLASS_FILES/java/lang/invoke/LambdaForm$MH000.class
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// dump: DUMP_CLASS_FILES/java/lang/invoke/LambdaForm$MH001.class
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// Invoked inside a Lambda
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// ----------------
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Runnable r = () -> {
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System.out.println("Invoked inside a Lambda");
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};
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r.run();
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}
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public static Instrumentation getInstrumentation() {
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return savedInstrumentation;
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}
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public static void agentmain(String args, Instrumentation inst) throws Exception {
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premain(args, inst);
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}
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}
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